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11.
A. M. Zyuzin M. A. Bakulin V. V. Radaikin N. V. Yantsen 《Physics of the Solid State》2017,59(2):268-273
Zero spin-wave mode in inhomogeneous magnetic films with orthorhombic anisotropy has been found to exhibit a change of its localization region in two of three typical angular dependences of resonance fields of high-intensity modes. It has been shown that the anisotropy fields on both sides of the film can be determined from the resonance fields of the zero and uppermost high-intensity spin-wave modes of spin-wave resonance spectra. 相似文献
12.
13.
The kinetics of methoxy-NNO-azoxymethane (I) hydrolysis in concentrated solutions of strong acids (HBr, HCl, HClO4, and H2SO4) has been investigated by a manometric method. The gas evolution rate is described by the equation corresponding to two consecutive
first-order reactions, with the rate constant of the second reaction considerably exceeding the rate constant of the first
reaction, i.e., k
2 {ie17-1} k
1. The temperature dependences of k
1 (s−1) in 47.59% HBr in the temperature range from 60 to 90°C and in 64.16% H2SO4 between 80 and 130°C are described by Arrhenius equations with IogA= 12.7 ± 1.5 and 13.6 ± 1.4 and E
a = 115 ± 10 and 137 ± 10 kJ/mol, respectively. The parameters of the Arrhenius equation for the rate constant k
2 for the reaction in 64.16% H2SO4 between 80 and 130°C are IogA= 9.1 ± 2.5 and E
a = 91 ± 18 kJ/mol. An analysis of the UV spectra of compound I in concentrated H2SO4 shows that I is a weak base $
(pK_{BH^ + } \approx - 6)
$
(pK_{BH^ + } \approx - 6)
. The rate-determining step of the hydrolysis of I is the attack of the nucleophile on the carbon atom of the MeO group of the protonated molecule of I. The resulting methyldiazene dioxide decomposes via a complicated mechanism to evolve N2, NO, and N2O. The pseudo-first-order rate constant k
1 of the reaction at 80°C depends strongly on the acid concentration and on the type of nucleophile (Br−, Cl−, or H2O). The relationship between k
1 and the rate constant k of the bimolecular nucleophilic substitution reaction (SN2) is given by the linear equation log$
[k_1 /(C_H + C_{Nu} )] = m^ \ne m*X_0 + \log (k/K_{BH^ + } )
$
[k_1 /(C_H + C_{Nu} )] = m^ \ne m*X_0 + \log (k/K_{BH^ + } )
, where $
C_{H^ + }
$
C_{H^ + }
and C
Nu are the concentrations of H+ and nucleophile, respectively; X
0 is the excess acidity; and m
≠ and m* are coefficients. The Swain-Scott equation log$
(k_{Nu} /k_{H_2 O} ) = ns
$
(k_{Nu} /k_{H_2 O} ) = ns
, where n is the nucleophilicity factor and s is the substrate constant (s = 0.72), is applicable to the rate constants k of the SN2 reactions of the protonated molecule of I with Br−, Cl−, and H2O. 相似文献
14.
The change in spin-wave resonance spectra in multilayer magnetic films occurring under the gradual transformation of a spin-pinned layer from the reactive medium into a dispersive state or vice versa is studied. Spatial spin-wave dispersion associated with the spin-pinned layer is established to occur. This dispersion is most markedly pronounced in films with a mixed mechanism of spin pinning. The dispersion observed allows the so-called effect of “repulsion” of spin-wave modes to be accounted for. 相似文献
15.
L. V. Bad’in L. N. Zyuzin S. I. Safronov Yu. K. Slavnov R. P. Tarasov 《Technical Physics》2005,50(2):249-258
Computer analysis of the image of an arbitrary (point or extended) source obtained in 3D electron-optic systems is performed.
The systems involve magnetostatic and electrostatic fields, which, respectively, focus and deflect the electron beams. Two
approaches to image scanning are considered where the scan potentials are applied in two (symmetric and asymmetric) modes.
It is shown that the spread function of the source, which characterizes the imaging quality of the system most fully, may
serve as a primary computational criterion. 相似文献
16.
I. N. Zyuzin 《Russian Chemical Bulletin》1985,34(11):2433-2434
Conclusions Allyl bromide alkylates the tetraethylammonium salt of N-methyl-N-nitrosohydroxylamine at both oxygen atoms to form N-methyl-N-allyloxydiazene N-oxide and methylallyloxynitrosamine in 1:1.6 ratio.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 11, pp. 2626–2628, November, 1985. 相似文献
17.
V. V. Kriventsov E. P. Yakimchuk B. N. Novgorodov D. I. Kochubey I. L. Simakova D. A. Zyuzin D. G. Aksenov A. V. Chistyakov A. S. Fedotov K. V. Golubev V. Yu. Murzin M. V. Tsodikov 《Bulletin of the Russian Academy of Sciences: Physics》2013,77(9):1190-1194
Model low-percentage metal oxide palladium catalysts are prepared from acetate complexes of Pd and Mn to study the nature of the activity and the genesis of nanostructured membrane catalyst Pd-Mn systems. A comprehensive study of the prepared model precursor compounds; specific features of their metal components in gels and oxides; and the genesis of the active component, local structure, and charge state is performed by EXAFS and XANES. Possible versions of structural models for the stabilization of metals on oxide supports aare discussed. 相似文献
18.
Frédérin abwergel Jacques Herbert Ballly Herbert Ballly H Beirao da Veiga VA Solonnikov 《偏微分方程通讯》2013,38(9-10):1323-1358
We study a class of stationary transport equation with nonlocal low-order tems We obtain the existence and uniqueness of a solution in sobolev spaces 相似文献
19.
非线性涡黏性系数模型和代数应力模型联系了线性涡黏性系数湍流模型和完整的微分
雷诺应力模型.随着它们受到日益关注,其形式也越来越多样化.本篇综述的目的是对这些模
型加以总结并比较它们之间的共同点及不同之处,指出它们与完整微分雷诺应力模型之间的
关系,以及相对于线性涡黏性系数模型而言它们在预报流场上所具有的优势. 相似文献
20.
I. N. Zyuzin 《Russian Journal of Applied Chemistry》2009,82(10):1829-1831
Safe method for synthesis of methoxy-NNO-azoxyethene by pyrolysis of 1,1-di(methoxy-NNO-azoxy) ethane in high yield was developed.
The method is based on use of dibutyl phthalate as phlegmatizer and polyphenols as inhibitors of radical polymerization. 相似文献